11-(9H-beta-carbolin-9-yl)-5H-indolo[3,2-b]quinoline 5H-quindoline, 11-(9H-pyrido[3,4-b]indol-9-yl)- InChI=1/C26H16N4/c1-4-10-20-18(8-1)24-25(29-20)26(19-9-2-5-11-21(19)28-24)30-22-12-6-3-7-16(22)17-13-14-27-15-23(17)30/h1-15,28